Improvement in watchmakers tools



1. F. YOUNG.

Watch Makers Tools.

Patented May 26,1874.

Jag.

No.l5l,333.

UNITED STA JULIUS F. YOUNG, OF OWATONNA, MINNESOTA.

Specification forming part of Letters Patent No. 151,333, dated May26,1874; application tiled Aprn 1s, 1874.

The object of this invention is to furnish means for reducing thetension and elasticity ot' hair-springs of watches, so as to vary thetime or action of the watch-movement from fast to slow, as may bedesired.

In the accompanying drawing, Figure lis a side View of the tool. Fig. 2is a top View, and Fig. 3 an end View.

Similar letters of reference indicate corresponding parts.

A is the body or bed of the tool, which is confined (when in use) in avise by griping the lug B on the under side of the bed. O is anadjustable rest, which is designed to hold between it and the stationarystand D any diameter ot'watch balance-wheel with the hair-sprin g andparts connected therewith. This rest O is adjusted, as may be desired,with reference to the stand D, by the finger-screw E. The arbor of thebalance-wheel rests in slots in the rest C and the stand, as representedin the drawing. F is a spiral spring on the screw E, between the rest Oand the body of the tool, to keep the rest steady and in position. G isthe` hair-spring. The balaneewheel with the hairspring being thusconfined, the end of the hairspring is taken hold of with a pair ofpliers or tweezers, and is gently drawn along under the spring-clamps Hand I. These clam ps are first raised by means ofthe fingerscrews J andK. The clamp I is then screwed down onto the haiihspring, and then theclamp II is screwed down. These clamps hold the hair-spring tlat to thebed A, so that with a scraper ot' any suitable kind the hair-spring maybe reduced so as to alter the running of the watch i'roin five minutesto an hour and a half in twentyfour hours. \Vhen the clamps are raisedthe hair-spring is allowed to slip back by its own tension, so as toassume its former diameter, and is readily recoiled. For producing thedesired eii'ect it is only necessary to scrape a space of, say,one-halt' inch ot the hair-spring. The balance-wheel and hair-springare. new taken out by turning the iingerscrew E, and replaced in thewatch.

This, it is believed, is the only reliable means of weakening` thehairspring of a watch. By the tool above described this may be done inthe inost expeditious and perfect manner.

Hayin g thus described my invention, I claim as new and desire to secureby Letters, Patent- A tool for watch-makers for reducing hairsprings,having a bed, A, and adjustable rest O, a stationary stand, l), clamps Hand I, and iinger-screws E and J K, arranged substantially as and forthe purposes herein shown and described.

JULIUS F. YOUNG.

IVitnesses:

HENRY Bonennn'r, J. WV. HALL.

